I agree, I think George's RCA books really were something of a 'game changer' in terms of people getting a better grasp on much of what is out there aside from the previous landmark work, which was Kindig. It was also in the 80s and 90s that there was something of a small explosion of books by varied authors primarily focused upon good (for the time) photography, much better than what was used in either Dillon's books or Kindig's catalog. So, while some "in the know" folks - primarily KRA associated - may have been very aware of Oerter and Albrecht and their attributed work prior to George's publications, I really don't think a lot of this stuff was even marginally known until he published RCA.
Bob has been at this longer than I for sure, and he may be able to offer more of a first-hand account of such things including what someone like Jack Brooks, who has likewise been at this a long time, may or may not have known.